Combined valve and valve-seat grinder



Jan. 3, 1928. 1,655,251

E. o. STARKIN COMBINED VALVE AND-VALVE SEAT GRINDER Filed Oct. 29. 1926 2 Sheets-Sheet l gwuawtoz Patented Jan. 3, .9.2. 8.

PATENT OFEICE EMIL 0. STARKIN, OF METUGHEN, NEW JERSEY.

, COMBINED VALVE AND VALVE-SEAT GRINDER.

Application filed October 29, 1926. Serial No. 144,953.

This invention relates to an improved valve and valve seat grinder, which is adapted to grind both the valve and valve seat at one operation.

An object of the invention is to provide a combined valve and valve seat grinder, which will grind or face both the valve and valve seat at one operation, and will positively give the same angular pitch to both faces being ground.

Another object of the invention is to provide a combined valve and valve seat grinder with a substantially cone-shaped body, in which a plurality of rotary grinding elements are mounted for reciprocation.

A further object of the invention is to provide a combined valve and valve seat grinder which will be constructed to receive interchangeable grinding rolls for rough grinding and for finishing the faces of the valve and valve seat.

A still further object of the invention is to provide a combined valve and valve seat grinder with a plurality of grinding rolls, and with interchangeable cams for attachment to the valve stems, whereby the grinding rolls may be reciprocated as they are rotated.

Other objects will appear as the description proceeds.

In the accompanying drawings which form a part of my application,

Figure 1 is a vertical sectional view partly in elevation of my improved valve and valve seat grinder, showing the same in position to grind a valve and valve seat.

Figure 2 is a plan view of my combined valve and valve seat grinder.

Figure 3 is a vertical sectional view through the grinder.

Figure 4 is a sectional view taken on the line 4-4 of Figure 3.

Figure 5 is an enlarged fragmentary detail view showing the method of holding the cover cap in position on the body of the grinder.

Figure 6 is a side elevation of the combined bushing and .cam, showing the relative positioning of a grinding roll thereon.

Figure 7 is a side elevation of the rough or shaper out grinder roll, and

Figure 8 is a side elevation of the finishing grinder roll.

Like characters of reference are used of the body 1 is less than the diameter of the grinding rolls 5, and therefore the rolls will extend beyond the inner and outer surfaces of the body to provide an effective grinding surface to grind the valve 4 and valve seat 6, respectively.

A cover cap or ring 7 is adapted to be removably secured to the top of the body 1, and is provided with a plurality of depending spring fingers 8 for engagement under the bead 9 about the periphery of the said body 1. The ring 7 serves to prevent the grinding rolls 5 from sliding out of the body, and being provided with three openings 10 in its upper surface, also affords means whereby the body may be rotated.

An internal shoulder or bead 11 is formed on the inner surface of the hollow shank portion 2 of the body, and limits the downward movement of the grinding rolls 5.

A combined bushing and cam 12 is adapted to slide into the hollow shank 2 until it abuts against the shoulder 11. The cam 12 being hollow through its central portion will also slide over the stem 13 of the valve 4, and will be secured thereto by means of the set screw 14. Access may be had to the set screw 14 through one or more openings 15 through the shank portion 2 of they body.

The lower end of the shank 2 is threaded externally at 16 to receive a threaded cap member 17 which isprovided with a central aperture through which the valve stem 13 is adapted to pass. A coil spring 18 will be inserted in the lower end of the shank portion 2 of the body to abut against the lower end of the combined cam and bushing 12 and the member 17, to normally hold the bushing 12 against the shoulded 11. It will be understood that one or more bushings 12 may be provided, each bushing havin a difl'erent size of central opening, to rece ve valve stems of difi'erent diameters.

A hand operated tool 19 will be provided to rotate boththe valve and the body 1 of the grinding tool. A central valve engaging stem 20 will engage the valve 4, wh le the three annularly disposed fingers 2 1 w1ll engage in the openings 10 in the r1ng 7. The tool 19 willbe geared to rotate the ring 7 and body 1 approximately ten turns to every one revolution of the valve-4.

The mode of operation of my improved valve and valve seat grinder is as follows: Assuming that the combined cam and bushing 12 is in position within the shank portion 2, and the valve 4 removed from its seat in the cylinder of the engine, the body is placed in the valve opening in the cylinder with the shank 2 extending downwardly therein. The outer surfaces of the in ing rolls 5 will contact with the valve seat 6. The valve 4 will then be insertedinto the bod 1, until the face of the valve contacts wit the inner surfaces of the grindingrolls 5. The set screw 14 will be tightened to hold the combined cam and bushing fixed to the valve stem, and the hand tool 19, will be caused to engage the valve and the body 1 of the grinder, whereupon rotation of the tool 19, will simultaneousl grind both the valve and its seat. After t e valve and seat have been rough ground by the rolls 5 making a shaper cut, the rolls are removed and finishing rolls 22 are inserted in the grinder, and a finished job is effected. The rolls 22 are formed with a grinding surface made from very minute diamond shaped teeth, which are made by suitably milling.

It will be apparent that many minor changes in detail of construction may be resorted to without departure from the spirit of the invention, and that I do not limit myself to the specific construction illustrated in the drawings, but to the construction designated by the scope of the appended 7 claims.

Having thus described my invention what I claim as new and desire to secure by Letters Patent of the United States is:

1. A valve and valve seat tool including a plurality of rotary reciprocating cutting rolls and means forreciprocating said rolls.

2. A valve and valve seat tool comprising a body, a plurality of cutting rolls carried thereby, means for rotating said body to rotate said rolls, and a cam for reciprocating said rolls during rotation.

3. A valve and valve seat tool comprising a0 a body, a plurality of interchangeable cutting rolls carried thereby, means for rotating said rolls, a cam for reciprocating said rolls during rotation, and means for limiting the endwise movement of 'said rolls.

4. A valve and valve seat tool com rising a body, a plurality of interchangea le reciprocating cutting rolls carried thereby, said rolls having a ortion of their surfaces extending beyond t e inside and outside of said body to dress a valve and a valve seat respectively atone operation.

5. A valve and valve seat tool comprising a body, a plurality of interchangeable cutting rolls carried thereby, said rolls having portions of .their surfaces extending beyond the inside and outside of said body to dress a valve and a valve seat respectively at one Operation, and a cam for reciprocating said rolls during rotation.

6. A valve and valve ,seat tool comprising a body a plurality of interchangeable cutting rolls carried thereby, said rolls having portions of'their surfaces extending beyond the inside and outside of said body to dress a valve and avalve seat respectively at one operation, a cam for reciprocating said rolls during rotation, and resilient means for tensioning said cam.

7. A valve and valve seat tool comprising a body, a plurality of interchangeable cutting rolls carried thereby, means for limiting the endwise movement of said rolls, said rolls having portions of their surfaces extending beyond the inside and outside of said body to dress a valve and a valve seat respectively at one operation, a cam for reciprocating said rolls during rotation, and adjustable tensioned resilient means for tensioning said cam.

8. A valve and valve seat tool comprising a cone-shaped body, a hollow shank depending therefrom, a plurality of interchangeable cutting rolls mounted in said body, means for limiting the endwise movement of said rolls, said rolls having portions of their surfaces extending beyond the inside and outside of said body to dress a valve and a valve seat respectively at one operation, a combined bushing and cam slidable in said hollow shank for reciprocating said rolls during rotation, means carried by said bushing for holding the same fixed to a valve stem, and adjustable resiliently tensioned means for tensioning said cam.

In testimony whereof I afiix my signature.

EMIL O. STARKIN. 

